New lariat ether carboxylic and hydroxamic acids: Synthesis and lanthanide ion complexation
作者:Sadik Elshani、Randal Noriyuki、Chien M. Wai、N. R. Natale、Richard A. Bartsch
DOI:10.1002/jhet.5570350416
日期:1998.7
group attachment site and identity of the acidic function. In general, the lariat ether hydroxamic acids were more efficient and selective lanthanide ion extractants than the corresponding lariat ether carboxylic acids. The 1H nmr and ir binding studies indicate that both the macrocyclic polyether unit and the proton-ionizable group are involved in lanthanide ion complexation.
合成了基于二苯并-13-冠-4,二苯并-14-冠-4,二苯并-16-冠-5和二苯并-19-冠-6环系的二十六个新的套索状醚羧酸和异羟肟酸,并且固体确定了二苯并-19-冠-6套索状醚异羟肟酸的α-态结构。这些质子可电离的套索状醚将镧系元素离子萃取到氯仿中的效率和选择性受冠醚环的大小,亲脂性基团连接位点和酸性官能团的强烈影响。通常,套索状醚异羟肟酸比相应的套索状醚羧酸更有效和更具选择性的镧系元素离子萃取剂。在1H nmr和ir结合研究表明,大环聚醚单元和质子可电离基团均参与镧系元素离子的络合。